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The answer depends on the units used for 21x19: inches, metres, kilometres? Since that information has not been provided it is not possible to answer the question sensibly.

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9y ago
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9y ago

21 x 19 feet is 399sq.ft.

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8y ago

You just need to multiply length times width to get the area. This will work out to 399 square feet.

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Q: How many square feet 21x19?
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